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fa593d66 PA |
1 | /* GNU/Linux/x86-64 specific low level interface, for the in-process |
2 | agent library for GDB. | |
3 | ||
42a4f53d | 4 | Copyright (C) 2010-2019 Free Software Foundation, Inc. |
fa593d66 PA |
5 | |
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 3 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
20 | ||
21 | #include "server.h" | |
a13c4696 | 22 | #include <sys/mman.h> |
7c3a12ca | 23 | #include "tracepoint.h" |
ae91f625 | 24 | #include "linux-x86-tdesc.h" |
268a13a5 | 25 | #include "gdbsupport/x86-xstate.h" |
fa593d66 PA |
26 | |
27 | /* Defined in auto-generated file amd64-linux.c. */ | |
28 | void init_registers_amd64_linux (void); | |
3aee8918 | 29 | extern const struct target_desc *tdesc_amd64_linux; |
fa593d66 PA |
30 | |
31 | /* fast tracepoints collect registers. */ | |
32 | ||
33 | #define FT_CR_RIP 0 | |
34 | #define FT_CR_EFLAGS 1 | |
35 | #define FT_CR_R8 2 | |
36 | #define FT_CR_R9 3 | |
37 | #define FT_CR_R10 4 | |
38 | #define FT_CR_R11 5 | |
39 | #define FT_CR_R12 6 | |
40 | #define FT_CR_R13 7 | |
41 | #define FT_CR_R14 8 | |
42 | #define FT_CR_R15 9 | |
43 | #define FT_CR_RAX 10 | |
44 | #define FT_CR_RBX 11 | |
45 | #define FT_CR_RCX 12 | |
46 | #define FT_CR_RDX 13 | |
47 | #define FT_CR_RSI 14 | |
48 | #define FT_CR_RDI 15 | |
49 | #define FT_CR_RBP 16 | |
50 | #define FT_CR_RSP 17 | |
51 | ||
52 | static const int x86_64_ft_collect_regmap[] = { | |
53 | FT_CR_RAX * 8, FT_CR_RBX * 8, FT_CR_RCX * 8, FT_CR_RDX * 8, | |
54 | FT_CR_RSI * 8, FT_CR_RDI * 8, FT_CR_RBP * 8, FT_CR_RSP * 8, | |
55 | FT_CR_R8 * 8, FT_CR_R9 * 8, FT_CR_R10 * 8, FT_CR_R11 * 8, | |
56 | FT_CR_R12 * 8, FT_CR_R13 * 8, FT_CR_R14 * 8, FT_CR_R15 * 8, | |
57 | FT_CR_RIP * 8, FT_CR_EFLAGS * 8 | |
58 | }; | |
59 | ||
60 | #define X86_64_NUM_FT_COLLECT_GREGS \ | |
61 | (sizeof (x86_64_ft_collect_regmap) / sizeof(x86_64_ft_collect_regmap[0])) | |
62 | ||
63 | void | |
64 | supply_fast_tracepoint_registers (struct regcache *regcache, | |
65 | const unsigned char *buf) | |
66 | { | |
67 | int i; | |
68 | ||
69 | for (i = 0; i < X86_64_NUM_FT_COLLECT_GREGS; i++) | |
70 | supply_register (regcache, i, | |
71 | ((char *) buf) + x86_64_ft_collect_regmap[i]); | |
72 | } | |
73 | ||
1cda1512 MK |
74 | ULONGEST |
75 | get_raw_reg (const unsigned char *raw_regs, int regnum) | |
6a271cae | 76 | { |
35f5825a | 77 | if (regnum >= X86_64_NUM_FT_COLLECT_GREGS) |
6a271cae PA |
78 | return 0; |
79 | ||
80 | return *(ULONGEST *) (raw_regs + x86_64_ft_collect_regmap[regnum]); | |
81 | } | |
82 | ||
0fb4aa4b PA |
83 | #ifdef HAVE_UST |
84 | ||
85 | #include <ust/processor.h> | |
86 | ||
87 | /* "struct registers" is the UST object type holding the registers at | |
88 | the time of the static tracepoint marker call. This doesn't | |
89 | contain RIP, but we know what it must have been (the marker | |
90 | address). */ | |
91 | ||
92 | #define ST_REGENTRY(REG) \ | |
93 | { \ | |
94 | offsetof (struct registers, REG), \ | |
95 | sizeof (((struct registers *) NULL)->REG) \ | |
96 | } | |
97 | ||
98 | static struct | |
99 | { | |
100 | int offset; | |
101 | int size; | |
102 | } x86_64_st_collect_regmap[] = | |
103 | { | |
104 | ST_REGENTRY(rax), | |
105 | ST_REGENTRY(rbx), | |
106 | ST_REGENTRY(rcx), | |
107 | ST_REGENTRY(rdx), | |
108 | ST_REGENTRY(rsi), | |
109 | ST_REGENTRY(rdi), | |
110 | ST_REGENTRY(rbp), | |
111 | ST_REGENTRY(rsp), | |
112 | ST_REGENTRY(r8), | |
113 | ST_REGENTRY(r9), | |
114 | ST_REGENTRY(r10), | |
115 | ST_REGENTRY(r11), | |
116 | ST_REGENTRY(r12), | |
117 | ST_REGENTRY(r13), | |
118 | ST_REGENTRY(r14), | |
119 | ST_REGENTRY(r15), | |
120 | { -1, 0 }, | |
121 | ST_REGENTRY(rflags), | |
122 | ST_REGENTRY(cs), | |
123 | ST_REGENTRY(ss), | |
124 | }; | |
125 | ||
126 | #define X86_64_NUM_ST_COLLECT_GREGS \ | |
127 | (sizeof (x86_64_st_collect_regmap) / sizeof (x86_64_st_collect_regmap[0])) | |
128 | ||
129 | /* GDB's RIP register number. */ | |
130 | #define AMD64_RIP_REGNUM 16 | |
131 | ||
132 | void | |
133 | supply_static_tracepoint_registers (struct regcache *regcache, | |
134 | const unsigned char *buf, | |
135 | CORE_ADDR pc) | |
136 | { | |
137 | int i; | |
138 | unsigned long newpc = pc; | |
139 | ||
140 | supply_register (regcache, AMD64_RIP_REGNUM, &newpc); | |
141 | ||
142 | for (i = 0; i < X86_64_NUM_ST_COLLECT_GREGS; i++) | |
143 | if (x86_64_st_collect_regmap[i].offset != -1) | |
144 | { | |
145 | switch (x86_64_st_collect_regmap[i].size) | |
146 | { | |
147 | case 8: | |
148 | supply_register (regcache, i, | |
149 | ((char *) buf) | |
150 | + x86_64_st_collect_regmap[i].offset); | |
151 | break; | |
152 | case 2: | |
153 | { | |
154 | unsigned long reg | |
155 | = * (short *) (((char *) buf) | |
156 | + x86_64_st_collect_regmap[i].offset); | |
157 | reg &= 0xffff; | |
158 | supply_register (regcache, i, ®); | |
159 | } | |
160 | break; | |
161 | default: | |
162 | internal_error (__FILE__, __LINE__, | |
163 | "unhandled register size: %d", | |
164 | x86_64_st_collect_regmap[i].size); | |
165 | break; | |
166 | } | |
167 | } | |
168 | } | |
169 | ||
170 | #endif /* HAVE_UST */ | |
171 | ||
a8806230 YQ |
172 | #if !defined __ILP32__ |
173 | /* Map the tdesc index to xcr0 mask. */ | |
174 | static uint64_t idx2mask[X86_TDESC_LAST] = { | |
175 | X86_XSTATE_X87_MASK, | |
176 | X86_XSTATE_SSE_MASK, | |
177 | X86_XSTATE_AVX_MASK, | |
178 | X86_XSTATE_MPX_MASK, | |
179 | X86_XSTATE_AVX_MPX_MASK, | |
180 | X86_XSTATE_AVX_AVX512_MASK, | |
181 | X86_XSTATE_AVX_MPX_AVX512_PKU_MASK, | |
182 | }; | |
183 | #endif | |
184 | ||
ae91f625 MK |
185 | /* Return target_desc to use for IPA, given the tdesc index passed by |
186 | gdbserver. */ | |
187 | ||
188 | const struct target_desc * | |
189 | get_ipa_tdesc (int idx) | |
190 | { | |
b4570e4b YQ |
191 | if (idx >= X86_TDESC_LAST) |
192 | { | |
193 | internal_error (__FILE__, __LINE__, | |
194 | "unknown ipa tdesc index: %d", idx); | |
195 | } | |
196 | ||
201506da PA |
197 | #if defined __ILP32__ |
198 | switch (idx) | |
199 | { | |
200 | case X86_TDESC_SSE: | |
b4570e4b | 201 | return amd64_linux_read_description (X86_XSTATE_SSE_MASK, true); |
201506da | 202 | case X86_TDESC_AVX: |
b4570e4b | 203 | return amd64_linux_read_description (X86_XSTATE_AVX_MASK, true); |
f02fd774 | 204 | case X86_TDESC_AVX_AVX512: |
b4570e4b | 205 | return amd64_linux_read_description (X86_XSTATE_AVX_AVX512_MASK, true); |
201506da PA |
206 | default: |
207 | break; | |
208 | } | |
209 | #else | |
b4570e4b | 210 | return amd64_linux_read_description (idx2mask[idx], false); |
201506da PA |
211 | #endif |
212 | ||
213 | internal_error (__FILE__, __LINE__, | |
214 | "unknown ipa tdesc index: %d", idx); | |
ae91f625 MK |
215 | } |
216 | ||
9c235a72 PA |
217 | /* Allocate buffer for the jump pads. The branch instruction has a |
218 | reach of +/- 31-bit, and the executable is loaded at low addresses. | |
219 | ||
220 | 64-bit: Use MAP_32BIT to allocate in the first 2GB. Shared | |
221 | libraries, being allocated at the top, are unfortunately out of | |
222 | luck. | |
223 | ||
224 | x32: Since MAP_32BIT is 64-bit only, do the placement manually. | |
225 | Try allocating at '0x80000000 - SIZE' initially, decreasing until | |
226 | we hit a free area. This ensures the executable is fully covered, | |
227 | and is as close as possible to the shared libraries, which are | |
228 | usually mapped at the top of the first 4GB of the address space. | |
229 | */ | |
a13c4696 MK |
230 | |
231 | void * | |
232 | alloc_jump_pad_buffer (size_t size) | |
233 | { | |
9c235a72 PA |
234 | #if __ILP32__ |
235 | uintptr_t addr; | |
236 | int pagesize; | |
237 | ||
238 | pagesize = sysconf (_SC_PAGE_SIZE); | |
239 | if (pagesize == -1) | |
240 | perror_with_name ("sysconf"); | |
241 | ||
242 | addr = 0x80000000 - size; | |
243 | ||
244 | /* size should already be page-aligned, but this can't hurt. */ | |
245 | addr &= ~(pagesize - 1); | |
246 | ||
247 | /* Search for a free area. If we hit 0, we're out of luck. */ | |
248 | for (; addr; addr -= pagesize) | |
249 | { | |
250 | void *res; | |
251 | ||
252 | /* No MAP_FIXED - we don't want to zap someone's mapping. */ | |
253 | res = mmap ((void *) addr, size, | |
254 | PROT_READ | PROT_WRITE | PROT_EXEC, | |
255 | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); | |
256 | ||
257 | /* If we got what we wanted, return. */ | |
258 | if ((uintptr_t) res == addr) | |
259 | return res; | |
260 | ||
261 | /* If we got a mapping, but at a wrong address, undo it. */ | |
262 | if (res != MAP_FAILED) | |
263 | munmap (res, size); | |
264 | } | |
265 | ||
266 | return NULL; | |
267 | #else | |
a13c4696 MK |
268 | void *res = mmap (NULL, size, PROT_READ | PROT_WRITE | PROT_EXEC, |
269 | MAP_PRIVATE | MAP_ANONYMOUS | MAP_32BIT, -1, 0); | |
270 | ||
271 | if (res == MAP_FAILED) | |
272 | return NULL; | |
273 | ||
274 | return res; | |
9c235a72 | 275 | #endif |
a13c4696 MK |
276 | } |
277 | ||
fa593d66 PA |
278 | void |
279 | initialize_low_tracepoint (void) | |
280 | { | |
a8806230 YQ |
281 | #if defined __ILP32__ |
282 | amd64_linux_read_description (X86_XSTATE_SSE_MASK, true); | |
283 | amd64_linux_read_description (X86_XSTATE_AVX_MASK, true); | |
284 | amd64_linux_read_description (X86_XSTATE_AVX_AVX512_MASK, true); | |
285 | #else | |
286 | for (auto i = 0; i < X86_TDESC_LAST; i++) | |
287 | amd64_linux_read_description (idx2mask[i], false); | |
288 | #endif | |
fa593d66 | 289 | } |